Vacuum-insulated metal milk-can.



L. R. STEEL.

VACUUM INSULATED METAL MILK GAN.

APPLICATION FILED JULY20,1910.

1,067,072. Patented July 8, 1913.

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` 'UNITED s'rATEs PATENT oEEroE.

LEONARD E. STEEL, 0E cLEvELaNn, oHIo.

vacUUM-msULarEn Entrar. MILK-CAN.

specification of rettei's raient.

Application filed July 20, 1916. Serial No. 572,900,

To all 'whomz't may concern.' A

. Be it known that I, LEONARD R. STEEL, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented new anduseful Improvements in Vacuum-Insulated Metal Milk-Cans,of which the following is a specication.

This invention relates to improvements in milk cans and moreparticularly to the type granted me by Letters Patent No. 947,864 of Feb. 1, 1910. The object of the above referred to patent was to produce amilk can lcapable of being kept in a highly sanitary condition at alltimes. Without departing from this object l seek to improve the milk canabove stated by a construction having for its primary object theprovision of a receptacle in which the milk may be kept at apredetermined temperature without the employment of a refrigerating orheating medium.

With, these and other objects in view, which will more fully hereinafterappear, the present invention consists in certain novel details ofconstruction and arrangement of parts, hereinafter fully. described,illustrated in the accompanying drawings,

and more particularly pointed outin the ap-l pended claim; it belngunderstood that various changes in the form, proportlon, size, and minordetails of the device may be made,-within the scope of the appendedclaim, without departing from the spirit or sacrilicing any of theadvantages of the invention.

In the accompanying drawings, forming part of the specicatiom-Figure 1is aside elevation of the device. 2 is a longitudinal sectional view ofthe same. 3

A is adelail perspective of the lower ring.

Similar numerals of reference are employed vto designate correspondingparts throughout.

As shown in Fig. 1 the can is arranged within a crate, the said cratebeing similar tothe crate shown in my former patent, .be-

fore referred to, with the exception that the handles of said crate inthe present instance are movable. As shown in Fig. 1 the crate includesa lower annular member '5 and an upper annular member 6 connected `andheld in spaced relation by means of slats 7. rlhe .slats 7 are securedat their upper ends'to the annular member 6 and their opposite ends aresecured to the lower annular memor its equivalent bent intosubstantially a' U-shape the opposite limbs of which are designated bythe numerals 10 and 11. The limbs 10 and 1l have their free end portionsbent in opposeddirections as shown at 12 and inserted into the oppositeends of the bulged portion 9. With this 'construction itV will be seenthat the handles are free to swing in a vertical plane when the crate isin an upright position. The can -forming part of the subject matter ofthe present invention is shown to include an outer receptacle a and aninner receptacle b. The outer receptacle includes a hollow bottom. rlhisbottom comprises two telescoping diskshaped sections of circularcontour, the body i portionof the lower of said sections designated byerally provided vwith an upwardly extending circular flange 14. ThebodyQ-portion of the qupper section is designated by the numeral 15 andisfperipherally provided with a depending flange 16. The upper sectionis considerably less in diameter than the lower section, and since thewidths of the flanges are approximately equal it will be evident whenthe flange 16-bears on the inner face of the body portion 13 that aspace will ex- -ist between the body portions 13 and 15.

being the numeral 13` and periph- The body of the outer receptacle isdesignated by the numeral 17 and is preferably formed of a single pieceof sheet metal rolled into the shape of a hollow cylinder,

the meeting ends of which overlap and are riveted or otherwise securedas shown at 18. The lower end portion of the body 17 is arranged betweenthe opposed faces of the flanges 14 and 16 of the bottom, the partsbeing securedby means of rings 19 and 20. The ring 19 is arranged on theinner surface of the Hang body portion 15 of the upper section of thebottom, while the ring 20 is arranged on the outer surface of the flangeextending upwardly from ,the body portion 13 of the e 16 depending fromthe lower section. The flanges, rings and lower end portions of the bodyare provided with alining openings for the reception of suitable wellknown fastening devices 21, the parts being further secured andhermetically sealed by means of solder. The upper end4 of the bodyportion 17 is provided with a dome-shaped head 22, the 'said'dome-shaped .head 22 having a central opening surrounded by aninteriorlythreaded neck 23. At the upper end of the neck 23 is a aredmouth 24, the function of which will appear later.

The inner section is preferably -of glass,l

1 china.v or any other analogous substance and -neck 28.

riorly screw-threaded, the lower and larger includes a circular bottom25, from thefperiphery'of which rises a circular side wall 26. `The sidewallA 26 has a dome-shaped head 27 which terminates in a shouldered Theshouldered neck .28 is exteportion of said neck screwing into theinteriorly threaded neck of the outer casing,

` and the upper or smaller portion of the said shouldered neck extendinginto the neck 23 off the outer section. It will be understood thatcement or any well known means may lbe interposed between the threadedportions above described so as to form therebetween a perfect air tightjoint. By reference now to the drawings it will be seen that aconsiderable space exists between the wall' 26 of the inner receptacleandthe body'portion 17 of the, outer receptacle, andA it will bemanifest that whenthe neck of the inner receptacle is screwed into theneck of 4the outer receptacle that a space will surround the innerreceptacle. Arranged in this space is a non-heat-conducting substancepreferably a thin sheet of cork, asbestos, or their equivalents. Thisnon-heat-c'onducting sub- ,stance or insulation comprises a body portion29, and an upper dome-shaped end portion 30. The body 'portion 29 `ofthe insulation is supported by a base member, this base membercomprising an annulus 31 peripherally provided with an outwardlyextending ange 32 upon vwhich bears the lower end of the body portion 29ofthe insulation. The annulus is provided with a plurality of spacedopenings 33. By reference now to Fig. 2 it will be seen that extendingthrough the body portions 13 and can and the inner glass receptacle andserves to effectively protect the inner glass `receptacle l should thewalls 17 become accidentally punctured or otherwise partly mutilated intransitor destroyed to the extent where the partial vacuum is destroyed.

The cover for, the 'inner receptacle is shown to comprise a circular bodportion designated by the numeral 34', epending from the periphery ofthe said body portion 34 is a circular lip 35, the said lip beinginteriorly screw-threaded to engage with the threads at the upper endportion of the shouldered neck 28. The cover for the outer receptaclecomprises a cylindrical body portion 36, of a size to snugly fit withinthe neck 23, thesaid body portion 36 being provided with a flared sidewall 37, of a size to snugly fit .within the flared mouth 24. Arrangedbetween the outer and inner ends of the flared portion of the cover andin spaced relation to the body 36 is a plate 38, said plate 38coperating with the body portion 36 and the bottom plate 40 to provide acompartment in which is arranged a non-heat-conducting disk 39. Withthis construction it will be manifest that when the air is exhausted'inthe compartment the Y heat of the atmosphere will be prevented froneffecting the milk in the inner receptac e.

The non-heat conducting substance 29 is spaced throughout from the wallsof the outer receptacle a andthe inner receptacle b so that it will notinterfere with the forming of a vacuum or rareed space between the wallsof the inner and outer receptacle, being perforated so as to permit theair to be readily and thoroughlyexhausted from the space when desired.By providing the thin strip of non-heat conducting substance it forms aprotecting element surrounding the inner receptacle b so as to protectthe receptacle in the event of the outer receptacle becomingaccidentally punctured or mutilated to the extent that the vacuum wouldbe destroyed. By providing the outer receptacle with the spaced lowerand l upper walls 13 andl 15 they form in their entirety an intervemngrareied or dead air space A immediately beneath the inner receptacle.Should the lower bottom member 13 become punctured, it is obvious thatthe purpose of the space A as an insulation beneath thebottom of theinner receptacle will be destroyed, but the bottom forming member 15,should it remain intact on partial accidentall destruction to the bottommember 13 would prevent destroying the vacuumin the space between thesaid inne and outer receptacles. l

I claim A can comprising an outer receptacle provided with an upperneck, an inner receptacle having a neck extending into the closing theouter receptacle, an annulus supported by the bottom and heat insulatingmaterial interposed 'between the side walls of the inner receptacle andthe side walls of the outer receptacle and terminally resting on itslower edge on the annulus, tue suspension of the inner receptacle Withinthe outer receptacle spacing the bottom of the latter from the bottom ofthe former and the space between the bottoms of the two receptaclesbeing in direct communication with the space between the sides of saidreceptacles.

In testimony whereof I aiiX my signature in presence of two witnesses.

LEONARD R. STEEL. Witnesses:

Maman LAWRENCE, Join: D. LLOYD.

